Gillian Quinn was born on January 5, 1972 in Rathfarnham, Dublin, Ireland. She has been married to Niall Quinn since July 1992. They have two children.
Her older sisters, Patricia Roe and Valerie Roe, pursued careers as singers. She has one other sister Bernie Roe-Cafolla, who is a Dublin socialite.
She met her ex-footballer husband Niall Quinn at the Dublin Motor Show in 1990 and they have two children, daughter Aisling (born 1994) and Mikey (born 1997).